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I want to learn about firearms, how to handle them, how to use them and how to talk about them without sounding like a moron for my worldbuilding and writing projects. I've considered options like talking to a professional, for example a hunter, policeman or soldier or going to a shooting range but these are to much effort in the beginning and would most likely be more beneficial once I got the basics down.

So what are great online sources (websites, YouTube channels) for learning about firearms and stuff surrounding them (like tactics, handling of guns,...)? I wouldn't mind books, but free sources would be preferable.

EDIT1: Optimally the sources should be understandable for an uninformed person. Yet if they lead to some higher level discussions of the subject I could read later to gain deeper insights this would be even better.

Tvtropes has an excellent article in their Useful notes section called "Gun Safety" as well as a write up of every military in the world, usually making an alliterative pun or historical joke in the title, allusion to a trademark weapon, or rhyming (the entry for the U.S. is called "Yanks with Tanks" while the UK's is "Brit's with Battleships").

https://tvtropes.org/pmwiki/pmwiki.php/UsefulNotes/GunSafety

Almost all their discussions on warfare and gun handling in fiction do discuss the good or bad aspects of porting to real life.

Forgotten Weapons, run by Ian McCollum, is both a website and youtube channel. He offers apolitical discussion on a huge variety of firearms, often talking about the history, variations, and mechanics of said guns. He is still active, and has done videos ranging from two-shot muskets to anti-aircraft cannon.

Here's one, with a free 45-page guide to writing guns in fiction
https://www.louiseharnbyproofreader.com/blog/how-to-write-about-guns-the-art-of-firearms-in-fiction

The best possible source is a knowledgeable person. A visit to a range, joining a shooting club, or perhaps going on a hunting trip with a skilled hunter will allow you to see first hand what is being done, and allow you to ask questions right on the spot.

These sorts of people can also direct you to other sources of information, such as books, websites, other groups and so on. Oddly enough, there are lots of military training films on YouTube. If you are looking for historical information, such as how a German infantry squad worked and moved in battle, then study these films. Since they are training films, and not for entertainment, you will lose most of the bizarre stuff that Hollywood movies are notorious for adding.

Finally, in most jurisdictions people who wish to purchase firearms need to take some sort of firearms safety course in order to apply for a licence or permit (depending on the jurisdiction), so you should sign up and get some hands on training with a firearm.

Of course, military weapons like fully automatic assault rifles or belt fed machine guns are not going to be available to you, unless you join the military as an infantryman (most other branches do use automatic rifles, but machine guns, grenade launchers and other weaponry of that nature is most commonly used by infantry soldiers). If you choose to go that route, I'll applaud your dedication to your craft, but point out there won't actually be much time to sit down and write...